CN104339123A - Bimetal composite pipe welding method - Google Patents
Bimetal composite pipe welding method Download PDFInfo
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- CN104339123A CN104339123A CN201310329887.4A CN201310329887A CN104339123A CN 104339123 A CN104339123 A CN 104339123A CN 201310329887 A CN201310329887 A CN 201310329887A CN 104339123 A CN104339123 A CN 104339123A
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- 238000003466 welding Methods 0.000 title claims abstract description 254
- 238000000034 method Methods 0.000 title claims abstract description 60
- 239000002131 composite material Substances 0.000 title claims abstract description 42
- 238000003754 machining Methods 0.000 claims abstract description 7
- 238000005520 cutting process Methods 0.000 claims description 25
- 239000011248 coating agent Substances 0.000 claims description 23
- 238000000576 coating method Methods 0.000 claims description 23
- 239000007789 gas Substances 0.000 claims description 23
- 230000007704 transition Effects 0.000 claims description 23
- 239000011324 bead Substances 0.000 claims description 18
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 239000010935 stainless steel Substances 0.000 claims description 14
- 229910001220 stainless steel Inorganic materials 0.000 claims description 14
- 238000005253 cladding Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 13
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 12
- 239000002537 cosmetic Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 8
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 8
- 229910052721 tungsten Inorganic materials 0.000 claims description 8
- 239000010937 tungsten Substances 0.000 claims description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 6
- 239000001569 carbon dioxide Substances 0.000 claims description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- NGONBPOYDYSZDR-UHFFFAOYSA-N [Ar].[W] Chemical compound [Ar].[W] NGONBPOYDYSZDR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 5
- 239000012895 dilution Substances 0.000 abstract description 4
- 238000010790 dilution Methods 0.000 abstract description 4
- 239000000203 mixture Substances 0.000 abstract description 3
- 230000004927 fusion Effects 0.000 abstract description 2
- 239000007769 metal material Substances 0.000 abstract description 2
- 210000001503 joint Anatomy 0.000 abstract 2
- 238000009499 grossing Methods 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 229910000679 solder Inorganic materials 0.000 description 5
- 238000009659 non-destructive testing Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000005476 soldering Methods 0.000 description 4
- 229910000975 Carbon steel Inorganic materials 0.000 description 3
- 239000010962 carbon steel Substances 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
- B23K31/027—Making tubes with soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
- B23K33/006—Filling of continuous seams for cylindrical workpieces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
- B23K9/044—Built-up welding on three-dimensional surfaces
- B23K9/046—Built-up welding on three-dimensional surfaces on surfaces of revolution
- B23K9/048—Built-up welding on three-dimensional surfaces on surfaces of revolution on cylindrical surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a bimetal composite pipe welding method and belongs to the field of metal material welding. The method at least includes the steps of firstly, machining a pipe orifice before inner build up welding; secondly, build up welding the inner surface of a pipe; thirdly, smoothing after welding and performing groove preparation; fourthly, on-site fitting up and welding, wherein the welding adopts 100% CO2 protection arc welding. The method has the advantages that the covering layer and the base layer at the pipe end of the bimetal composite pipe adopt the pipe orifice inner build up welding technology which is high in quality and efficiency and low in dilution rate, the covering layer and the base layer at the pipe orifice are changed from traditional mechanical composition into molecular association, the stress concentration part caused by the self structure of the composite pipe is separated from the weak part of a butt joint weld joint fusion line, welding cracks and air holes are prevented, the corrosion resistance of a welding connector is increased, construction difficulty of on-site butt joint welding is lowered, and the method is high in construction efficiency, reliable in welding quality, low in cost and especially applicable to circumferential welding of the large-diameter bimetal composite pipe.
Description
Technical field
The present invention relates to Metal Material Welding field, particularly a kind of composite bimetal pipe welding method.
Background technology
Dual-metal clad steel pipe is by coating steel pipe or the thinner Novel composite pipe that is entrenched togather of stainless steel tube brute force of welded tube, seamless steel pipe and wall thickness.Composite bimetal pipe basic unit (base tube) adopts carbon steel or low alloy steel pipe, coating (internal lining pipe) adopts thin-wall stainless steel, have the advantages that intensity is high, corrosion resistance good, cost is low, the effect of pressure-bearing and pipeline rigid support is responsible for by outer base tube, internal lining pipe bears corrosion resistant effect, composite bimetal pipe is widely used in the industrial circles such as oil field, chemical industry, electric power, especially popularity application in petroleum gas gathering line, Oil/gas Well sleeve pipe.
Traditional dual-metal clad steel pipe solder technology mainly contains two kinds: the first is the welding first carrying out inwall cladding, and then carry out the welding of transition zone and basic unit, welding material all uses stainless steel.The second is that weld seam is divided into coating weld seam and basic unit's weld seam, is welded for twice, and without independent stainless steel composite bed weld seam, the welding material of coating weld seam adopts stainless steel material, and the welding rod of mild steel basic unit weld seam adopts mild steel arc welding electrode.
Realizing in process of the present invention, inventor finds that prior art at least exists following problem:
The defect that the first solder technology existing exists is: during a coating thickness thinner (being less than 2mm), and ground floor welding easily produces burns defect; When b welds cladding, due to thermal contraction, coating may be separated with basic unit and form gap, and graded seal easily produces defect; Air, water or the booty that may exist between coating with basic unit in c tubulation process may cause gas hole defect when transition zone welds in weld seam.
The defect that existing the second solder technology exists is: during the welding of a ground floor transition zone; the air that may exist between coating with basic unit in tubulation process, water or booty cause gas hole defect when transition zone welds in possibility, thus cause the degradation of the corrosion resisting property of weld seam; When b carries out the welding of second layer weld seam, adopt the welding material of carbon steel composition to weld on the transition zone welding bead of stainless steel composition, cr, ni alloying element in weld seam is increased, easily forms the martensitic structure of hardening, affect the plasticity of joint, toughness, time serious, also may produce cold crack.
And these two kinds of solder technology also exist common defect: when weld seam produces misalignment, joint weld seam anticorrosion layer effective thickness reduces, and the corrosion resisting property of welding point is reduced.
At present, dual-metal clad steel pipe generally adopts mechanical combination process, basic unit and coating rely on tension force laminating, common process before being butt welding first with argon arc welding by basic unit and the soldering and sealing of coating pipe end, reproduce field butt welding, this welding procedure makes mouth of pipe soldering and sealing position have larger stress to concentrate, and easily cracks.Especially heavy caliber composite bimetal pipe (diameter >=350mm), because steel pipe curvature is little, tension force is relatively little, the stress of mouth of pipe soldering and sealing position is concentrated even more serious, more easily crack, the technical difficulty of welding composite bimetal pipe is at the scene very large, and not easily detects due to crack defect during Non-Destructive Testing, causes hidden danger of quality.
Summary of the invention
In order to solve the problem of prior art, embodiments provide a kind of composite bimetal pipe welding method.Technique for overlaying in the mouth of pipe adopting high-quality, efficient, low dilution rate, avoid the generation of weld crack and pore, improve corrosion resisting property, construction efficiency is high, reliable welding quality.Described technical scheme is as follows:
A kind of composite bimetal pipe welding method, described method at least comprises: mouth of pipe machined before built-up welding in step 1); Step 2) pipe internal surface built-up welding welding; Step 3) postwelding scabbles and retaining wall on slope; Step 4) field assembly and welding procedure step; Welding process adopts 100% carbon dioxide (CO
2) shielded arc welding.
Particularly, mouth of pipe machined before built-up welding in described step 1); Comprise the coating and part basic unit that cut segment of cutting near the composite bimetal pipe mouth of pipe; Described step 2) pipe internal surface built-up welding welding; Overlay clad metal in the position being included in described step 1) machining; Described step 3) postwelding scabbles and retaining wall on slope; Be included in described step 2) cut interior overlay cladding the raised area and the mouth of pipe section of reserving afterwards, form groove; Described step 4) field assembly and welding; Comprise the composite bimetal pipe group after by the processing of described step 3) to, be welded into pipeline.
Particularly, mouth of pipe machined before built-up welding in described step 1); Be be the described coating excision of 30-100mm by segment of cutting length described in pipe end, and to cut described basic unit wall thickness be 1 ± 0.3mm; It is 10-40mm that the described mouth of pipe reserves segment length.
Particularly, described step 2) pipe internal surface built-up welding welding; It is the coating metal adopting the gas metal-arc welding of stainless steel solid welding wire at least two-layer to described segment of cutting inside surfacing; built-up welding gradation is carried out; each welding one deck, uses identical with clad material, or selects the stainless steel wlding that chromium, nickel element content are high.
Further, the ground floor built-up welding wlding trade mark of described segment of cutting selects E309LT1-1 transition welding wire, and the described second layer built-up welding wlding trade mark selects E316LT1-1 bead welding wire; The welding condition of described segment of cutting surface ground floor built-up welding and second layer built-up welding is: wlding diameter is 1.2mm; Welding current is 160-200A; Arc voltage is 25-29V; Speed of welding is 50-60cm/min; Shield gas flow rate is 15-25L/min.
Particularly, described step 3) postwelding scabbles and retaining wall on slope; By concordant with former inner-walls of duct for overlay cladding the raised area excision in described segment of cutting, the allowed band height that deposited metal surface exceeds former inner-walls of duct surface is 0-0.2mm, and be not less than former inner-walls of duct, and the described mouth of pipe section of reserving is excised and pours out described groove, described bevel angle is 25 °-29 °.
Particularly, described step 4) field assembly and welding; Be adopt argon tungsten arc process to carry out a root bead, b transition weldering, adopt self-protection flux-cored wire semiautomatic welding to carry out c and fill weldering, d cosmetic welding.
Further, described a root bead adopts gas tungsten arc welding (GTAW), and described a root bead welding condition is: wlding model is ER316L; Wlding diameter is 2.5mm; Welding direction be on to; Welding current is 55-80A; Arc voltage is 8-13V; Speed of welding is 5-12cm/min; Back side argon flow amount is 10-15L/min.
Further, described b transition weldering adopts gas tungsten arc welding (GTAW), and the welding condition of described ground floor transition weldering and second layer transition weldering is: wlding model is ER309; Wlding diameter is 2.5mm; Welding direction be on to; Welding current is 60-100A; Arc voltage is 8-13V; Speed of welding is 6-13cm/min; Back side argon flow amount is 10-15L/min.
Further, described c fills weldering and adopts self-protection flux-cored wire semiautomatic welding (FCAW), and the welding condition that described c fills weldering is: wlding model is E71T8-Ni1J; Wlding diameter is 2.0mm; Welding direction be lower to; Welding current is 200-280A; Arc voltage is 19-21V; Speed of welding is 14-28cm/min.
Further, described d cosmetic welding adopts self-protection flux-cored wire semiautomatic welding (FCAW), and the welding condition of described d cosmetic welding is: wlding model is E71T8-Ni1J; Wlding diameter is 2.0mm; Welding direction be lower to; Welding current is 200-260A; Arc voltage is 18-21V; Speed of welding is 12-26cm/min.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
By technique for overlaying in the mouth of pipe that composite bimetal pipe pipe end place's coating and basic unit adopted high-quality, efficient, low dilution rate, be that molecule combines by the coating at mouth of pipe place and basic unit by traditional mechanical type convergent improvement, overcome the defect that prior art exists, the stress concentration portion position that multiple tube is caused because of self structure is separated with the weak part of butt weld fusion line, avoid the generation of weld crack and pore, the corrosion resisting property of welding point is improved, reduce the difficulty of construction of field joint weldering, this welding method construction efficiency is high, reliable welding quality, cost is low.Be applicable to the welding of the field composite bimetal pipes such as conveying, oil refining, chemical industry and pipe fitting, be specially adapted to the boxing welding of heavy caliber composite bimetal pipe, have broad application prospects.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the multiple tube one end generalized section after completing machined before the interior built-up welding of the composite bimetal pipe welding method that the embodiment of the present invention provides;
Fig. 2 is the multiple tube one end generalized section before the interior heap postwelding reconditioning groove of the composite bimetal pipe welding method that the embodiment of the present invention provides;
Fig. 3 is the multiple tube one end generalized section after the retaining wall on slope of the composite bimetal pipe welding method that the embodiment of the present invention provides completes.
In figure, each symbol represents that implication is as follows:
1 basic unit, 2 coating, 3 segment of cutting, 4 mouth of pipe sections of reserving, 5 grooves.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Shown in Fig. 1, Fig. 2, Fig. 3, be that the composite bimetal pipe of 508mm is welded as example relatively with external diameter, carbon steel base layer 1 thickness is 16mm, and stainless steel cladding 2 thickness is 2mm.
Particularly, as preferably, described composite bimetal pipe welding method at least comprises: mouth of pipe machined before built-up welding in step 1); Comprise the coating 2 and part basic unit 1 that cut segment of cutting 3 near the composite bimetal pipe mouth of pipe; Step 2) pipe internal surface built-up welding welding; Overlay clad metal in the position being included in step 1) machining; Step 3) postwelding scabbles and retaining wall on slope; Be included in step 2) cut interior overlay cladding the raised area and the mouth of pipe section of reserving 4 afterwards, form groove 5; The processing steps such as step 4) field assembly and welding; Comprise by step 3) cut and processing after composite bimetal pipe group to, be welded into pipeline.Welding process adopts 100% carbon dioxide (CO
2) shielded arc welding.Below each processing step is described in detail:
Mouth of pipe machined before built-up welding in step 1);
Particularly, after line up ovality corrects, within the scope of pipe end certain length, adopt machining process to cut, as Fig. 1, the coating 2 being 30-100mm scope by pipe end segment of cutting 3 length excises, and to cut basic unit 1 wall thickness be 1 ± 0.3mm; For preventing the mouth of pipe because of built-up welding welding stress generation necking deformation, the mouth of pipe section of reserving 4 length is 10-40mm, does not cut, to increase mouth of pipe rigidity;
Further, segment of cutting 3 length of the described cutting mouth of pipe is 40 ± 5mm, and total cutting depth is 3 ± 0.25mm, and wherein the cutting depth of coating 2 is 2mm, and the cutting depth of basic unit 1 is 1 ± 0.25mm; The mouth of pipe section of reserving 4 length is 20mm.
Step 2) pipe internal surface built-up welding welding;
Particularly; adopt the coating metal that the gas metal-arc welding of stainless steel solid welding wire is at least two-layer to segment of cutting 3 inside surfacing; as Fig. 2; built-up welding gradation is carried out; each welding one deck; use identical with clad material, or select the stainless steel wlding that chromium, nickel element content are higher, welding process adopts 100% carbon dioxide (CO
2) shielded arc welding, this gas shielded arc welding take carbon dioxide gas as protective gas, carries out the method for welding, simple to operate, is suitable for automatic welding and comprehensive welding.
Further, the ground floor built-up welding wlding trade mark of described segment of cutting 3 selects E309LT1-1 transition welding wire, and the described second layer built-up welding wlding trade mark selects E316LT1-1 bead welding wire; The welding condition of the surperficial ground floor built-up welding of described segment of cutting 3 and second layer built-up welding is: wlding diameter is 1.2mm; Welding current is 160-200A; Arc voltage is 25-29V; Speed of welding is 50-60cm/min; Shield gas flow rate is 15-25L/min.
In sum, described step 2) major parameter of pipe internal surface built-up welding welding procedure is auspicious sees the following form 1:
Wherein, DC-represents that welding wire connects positive pole, and DC+(does not mark) represent that welding wire connects negative pole.
Described welding method gas metal-arc welding (GMAW) is a kind of under gas shield, and the welding wire utilizing the arc-melting between welding wire and weldment to feed continuously and mother metal form the welding method of molten bath and weld seam, has the advantages such as efficient, high-quality, low consumption.Described built-up welding be with electric welding or autogenous soldering metal molten, pile up on the segment of cutting 3 of the mouth of pipe, be a kind of economy as material surface modifying and welding method fast; The setting of the welding condition of described ground floor built-up welding and second layer built-up welding has less mother metal dilution, and higher deposition rate and excellent overlay properties, can play the effect of overlay cladding most effectively.
Step 3) postwelding scabbles and retaining wall on slope;
Particularly, described interior built-up welding complete and through outward appearance detect and ray detection qualified after, adopt machining to cut overlay cladding the raised area in segment of cutting 3 to remove, interior overlay cladding should be concordant with former inner-walls of duct, as Fig. 3, the allowed band height that deposited metal surface exceeds former inner-walls of duct surface is 0-0.2mm, but must not lower than former inner-walls of duct, the stainless steel cladding 2 of non-surfacing part must not be damaged, after interior overlay cladding scabbles, again the mouth of pipe section of reserving 4 is excised, finally pour out groove 5 in mouth of pipe planar end surface angle cutter machining, groove 5 angle is 25 °-29 °, test with universal protractor.
Step 4) field assembly and welding;
Particularly, at composite bimetal pipe internal argon-filling gas, after air discharge is clean, adopt argon tungsten arc process to carry out a root bead, b transition weldering, adopt self-protection flux-cored wire semi-automatic welding technique to carry out c filling weldering, d cosmetic welding.
The welding method of described a root bead adopts gas tungsten arc welding (GTAW), and welding quality easily ensures.Its electrode tungsten is made, and has very high fusing point, non-fusible due to it; so there is no loss in welding process; protective gas uses as solder flux, and nearly all metal can be welded by argon tungsten-arc welding, can provide high-quality welding to thin plate.GTAW is the method controlling root pass in the gas protective arc welding of automatic side, wherein weld ground and be attached to back of work along sealing wire, welding realizes from surface of the work side automatically, comprise: longitudinally put a kind of conductive material at welding surface of bottom material, conductive material selects metallic foil, wire netting or metal wire; Detect the voltage between workpiece and conductive material when welding, control the reference voltage that this voltage equals predetermined.Obtained their difference by comparison reference voltage and measuring voltage, and revise the mobile station speed corresponding to this differential voltage, make measuring voltage equal this reference voltage.
Further, bottom one deck weld seam when described a root bead refers generally to weld, its welding condition is: wlding model is ER316L; Wlding diameter is 2.5mm; Welding direction be on to; Welding current is 55-80A; Arc voltage is 8-13V; Speed of welding is 5-12cm/min; Back side argon flow amount is 10-15L/min; Use short electric arc during described root bead as far as possible, prevent electric arc from merging basic unit 1 mother metal, cause harmful element to enter root bead weld seam, thus affect the corrosion resistance of root bead layer.
Particularly, the welding method of described b transition weldering adopts gas tungsten arc welding (GTAW), and described transition weldering adopts thin welding wire, low-voltage and small area analysis, and molten drop is tiny and transition frequency is high, and electric arc is highly stable, splashes little, and appearance of weld is well attractive in appearance.
Further, the welding condition of described ground floor transition weldering and second layer transition weldering is: wlding model is ER309; Wlding diameter is 2.5mm; Welding direction be on to; Welding current is 60-100A; Arc voltage is 8-13V; Speed of welding is 6-13cm/min; Back side argon flow amount is 10-15L/min.
Particularly, described c fills welding method employing self-protection flux-cored wire semiautomatic welding (FCAW) of weldering.Adopt self-protection flux-cored wire semi-automatic welding technique, when ground floor fills weldering, electric current is not easily excessive, prevents to burn.
Further, it is on the weld seam of a root bead, again weld several times formed that described c fills weldering, and its welding condition is: wlding model is E71T8-Ni1J; Wlding diameter is 2.0mm; Welding direction be lower to; Welding current is 200-280A; Arc voltage is 19-21V; Speed of welding is 14-28cm/min.
Particularly, described d cosmetic welding is the weld seam of one deck topmost, and its welding method adopts self-protection flux-cored wire semiautomatic welding (FCAW), adopts carbon dioxide (CO
2) shielded arc welding can reduce costs, economical and practical.
The welding condition of described d cosmetic welding is: wlding model is E71T8-Ni1J; Wlding diameter is 2.0mm; Welding direction be lower to; Welding current is 200-260A; Arc voltage is 18-21V; Speed of welding is 12-26cm/min.
In sum, a root bead, b transition weldering in described step 4) field assembly and welding, c fills weldering, d cosmetic welding technique major parameter is auspicious sees the following form 2:
Wherein, DC+ represents that tungsten electrode (welding wire) connects source of welding current negative pole of output end; Weldment connects source of welding current output head anode.
First visual appearance detection is carried out after described composite bimetal pipe welding, qualified rear basis " bearing device Non-Destructive Testing " standard (JB/T4730) carries out Non-Destructive Testing, Non-Destructive Testing is not destroying under workpiece prerequisite, checks the various technical methods of workpiece gross imperfection or measuring workpieces feature.Through mechanical property test, its intensity, clod wash, impact flexibility require to meet " bearing device qualification of welding procedure " (NB/T47014) standard.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a composite bimetal pipe welding method, is characterized in that, described method at least comprises: mouth of pipe machined before built-up welding in step 1); Step 2) pipe internal surface built-up welding welding; Step 3) postwelding scabbles and retaining wall on slope; Step 4) field assembly and welding procedure step; Welding process adopts 100% carbon dioxide (CO
2) shielded arc welding.
2. composite bimetal pipe welding method according to claim 1, is characterized in that, mouth of pipe machined before built-up welding in described step 1); Comprise the coating (2) and part basic unit (1) that cut segment of cutting (3) near the composite bimetal pipe mouth of pipe; Described step 2) pipe internal surface built-up welding welding; Overlay clad metal in the position being included in described step 1) machining; Described step 3) postwelding scabbles and retaining wall on slope; Be included in described step 2) cut interior overlay cladding the raised area and the mouth of pipe section of reserving (4) afterwards, form groove (5); Described step 4) field assembly and welding; Comprise the composite bimetal pipe group after by the processing of described step 3) to, be welded into pipeline.
3. composite bimetal pipe welding method according to claim 2, is characterized in that, mouth of pipe machined before built-up welding in described step 1); Be be described coating (2) excision of 30-100mm by segment of cutting described in pipe end (3) length, and to cut described basic unit (1) wall thickness be 1 ± 0.3mm; The described mouth of pipe section of reserving (4) length is 10-40mm.
4. composite bimetal pipe welding method according to claim 2, is characterized in that, described step 2) pipe internal surface built-up welding welding; It is the coating metal adopting the gas metal-arc welding of stainless steel solid welding wire at least two-layer to described segment of cutting (3) inside surfacing; built-up welding gradation is carried out; each welding one deck, uses identical with clad material, or selects the stainless steel wlding that chromium, nickel element content are high.
5. composite bimetal pipe welding method according to claim 4, it is characterized in that, the ground floor built-up welding wlding trade mark of described segment of cutting (3) selects E309LT1-1 transition welding wire, and the described second layer built-up welding wlding trade mark selects E316LT1-1 bead welding wire; The welding condition of the surperficial ground floor built-up welding of described segment of cutting (3) and second layer built-up welding is: wlding diameter is 1.2mm; Welding current is 160-200A; Arc voltage is 25-29V; Speed of welding is 50-60cm/min; Shield gas flow rate is 15-25L/min.
6. composite bimetal pipe welding method according to claim 2, is characterized in that, described step 3) postwelding scabbles and retaining wall on slope; By concordant with former inner-walls of duct for the excision of described segment of cutting (3) interior overlay cladding the raised area, the allowed band height that deposited metal surface exceeds former inner-walls of duct surface is 0-0.2mm, and be not less than former inner-walls of duct, and the described mouth of pipe section of reserving (4) is excised and pours out described groove (5), described groove (5) angle is 25 °-29 °.
7. composite bimetal pipe welding method according to claim 2, is characterized in that, described step 4) field assembly and welding; Be adopt argon tungsten arc process to carry out a root bead, b transition weldering, adopt self-protection flux-cored wire semiautomatic welding to carry out c and fill weldering, d cosmetic welding.
8. composite bimetal pipe welding method according to claim 7, is characterized in that, described a root bead adopts gas tungsten arc welding (GTAW), and described a root bead welding condition is: wlding model is ER316L; Wlding diameter is 2.5mm; Welding direction be on to; Welding current is 55-80A; Arc voltage is 8-13V; Speed of welding is 5-12cm/min; Back side argon flow amount is 10-15L/min.
9. composite bimetal pipe welding method according to claim 7, it is characterized in that, described b transition weldering adopts gas tungsten arc welding (GTAW), and the welding condition of described ground floor transition weldering and second layer transition weldering is: wlding model is ER309; Wlding diameter is 2.5mm; Welding direction be on to; Welding current is 60-100A; Arc voltage is 8-13V; Speed of welding is 6-13cm/min; Back side argon flow amount is 10-15L/min.
10. composite bimetal pipe welding method according to claim 7, is characterized in that, described c fills weldering and adopts self-protection flux-cored wire semiautomatic welding (FCAW), and the welding condition that described c fills weldering is: wlding model is E71T8-Ni1J; Wlding diameter is 2.0mm; Welding direction be lower to; Welding current is 200-280A; Arc voltage is 19-21V; Speed of welding is 14-28cm/min.
11. composite bimetal pipe welding methods according to claim 7, is characterized in that, described d cosmetic welding adopts self-protection flux-cored wire semiautomatic welding (FCAW), and the welding condition of described d cosmetic welding is: wlding model is E71T8-Ni1J; Wlding diameter is 2.0mm; Welding direction be lower to; Welding current is 200-260A; Arc voltage is 18-21V; Speed of welding is 12-26cm/min.
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